2018-08-27 14:32:32 +00:00
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Subject: sched: Limit the number of task migrations per batch
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Mon, 06 Jun 2011 12:12:51 +0200
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2019-02-27 18:51:46 +00:00
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.tar.xz
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2018-08-27 14:32:32 +00:00
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Put an upper limit on the number of tasks which are migrated per batch
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to avoid large latencies.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/sched/core.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/kernel/sched/core.c
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+++ b/kernel/sched/core.c
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2018-10-30 12:40:05 +00:00
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@@ -44,7 +44,11 @@ const_debug unsigned int sysctl_sched_fe
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2018-08-27 14:32:32 +00:00
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* Number of tasks to iterate in a single balance run.
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* Limited because this is done with IRQs disabled.
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*/
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2018-10-30 12:40:05 +00:00
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+#ifdef CONFIG_PREEMPT_RT_FULL
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2018-08-27 14:32:32 +00:00
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+const_debug unsigned int sysctl_sched_nr_migrate = 8;
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2018-10-30 12:40:05 +00:00
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+#else
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const_debug unsigned int sysctl_sched_nr_migrate = 32;
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2018-08-27 14:32:32 +00:00
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+#endif
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/*
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2018-10-30 12:40:05 +00:00
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* period over which we measure -rt task CPU usage in us.
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